lib/tdb2/test/failtest_helper.c

   1 #include "failtest_helper.h"
   2 #include "logging.h"
   3 #include <string.h>
   4 #include <ccan/tap/tap.h>
   5
   6 /* FIXME: From ccan/str */
   7 static inline bool strends(const char *str, const char *postfix)
   8 {
   9         if (strlen(str) < strlen(postfix))
  10                 return false;
  11
  12         return !strcmp(str + strlen(str) - strlen(postfix), postfix);
  13 }
  14
  15 bool failmatch(const struct failtest_call *call,
  16                const char *file, int line, enum failtest_call_type type)
  17 {
  18         return call->type == type
  19                 && call->line == line
  20                 && ((strcmp(call->file, file) == 0)
  21                     || (strends(call->file, file)
  22                         && (call->file[strlen(call->file) - strlen(file) - 1]
  23                             == '/')));
  24 }
  25
  26 static const struct failtest_call *
  27 find_repeat(const struct failtest_call *start, const struct failtest_call *end,
  28             const struct failtest_call *call)
  29 {
  30         const struct failtest_call *i;
  31
  32         for (i = start; i < end; i++) {
  33                 if (failmatch(i, call->file, call->line, call->type))
  34                         return i;
  35         }
  36         return NULL;
  37 }
  38
  39 static bool is_nonblocking_lock(const struct failtest_call *call)
  40 {
  41         return call->type == FAILTEST_FCNTL && call->u.fcntl.cmd == F_SETLK;
  42 }
  43
  44 static bool is_unlock(const struct failtest_call *call)
  45 {
  46         return call->type == FAILTEST_FCNTL
  47                 && call->u.fcntl.arg.fl.l_type == F_UNLCK;
  48 }
  49
  50 bool exit_check_log(struct failtest_call *history, unsigned num)
  51 {
  52         unsigned int i;
  53
  54         for (i = 0; i < num; i++) {
  55                 if (!history[i].fail)
  56                         continue;
  57                 /* Failing the /dev/urandom open doesn't count: we fall back. */
  58                 if (failmatch(&history[i], URANDOM_OPEN))
  59                         continue;
  60
  61                 /* Similarly with read fail. */
  62                 if (failmatch(&history[i], URANDOM_READ))
  63                         continue;
  64
  65                 /* Initial allocation of tdb doesn't log. */
  66                 if (failmatch(&history[i], INITIAL_TDB_MALLOC))
  67                         continue;
  68
  69                 /* We don't block "failures" on non-blocking locks. */
  70                 if (is_nonblocking_lock(&history[i]))
  71                         continue;
  72
  73                 if (!tap_log_messages)
  74                         diag("We didn't log for %u (%s:%u)",
  75                              i, history[i].file, history[i].line);
  76                 return tap_log_messages != 0;
  77         }
  78         return true;
  79 }
  80
  81 /* Some places we soldier on despite errors: only fail them once. */
  82 enum failtest_result
  83 block_repeat_failures(struct failtest_call *history, unsigned num)
  84 {
  85         const struct failtest_call *i, *last = &history[num-1];
  86
  87         if (failmatch(last, INITIAL_TDB_MALLOC)
  88             || failmatch(last, URANDOM_OPEN)
  89             || failmatch(last, URANDOM_READ)) {
  90                 if (find_repeat(history, last, last))
  91                         return FAIL_DONT_FAIL;
  92                 return FAIL_PROBE;
  93         }
  94
  95         /* Unlock or non-blocking lock is fail-once. */
  96         if (is_unlock(last)) {
  97                 /* Find a previous unlock at this point? */
  98                 for (i = find_repeat(history, last, last);
  99                      i;
 100                      i = find_repeat(history, i, last)) {
 101                         if (is_unlock(i))
 102                                 return FAIL_DONT_FAIL;
 103                 }
 104                 return FAIL_PROBE;
 105         } else if (is_nonblocking_lock(last)) {
 106                 /* Find a previous non-blocking lock at this point? */
 107                 for (i = find_repeat(history, last, last);
 108                      i;
 109                      i = find_repeat(history, i, last)) {
 110                         if (is_nonblocking_lock(i))
 111                                 return FAIL_DONT_FAIL;
 112                 }
 113                 return FAIL_PROBE;
 114         }
 115
 116         return FAIL_OK;
 117 }